1/*
2 * Copyright (c) 1982, 1986, 1988, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)uipc_mbuf.c 8.2 (Berkeley) 1/4/94
34 * $FreeBSD: head/sys/kern/uipc_mbuf.c 78155 2001-06-13 00:36:41Z peter $
35 */
36
37#include "opt_param.h"
38#include <sys/param.h>
39#include <sys/systm.h>
40#include <sys/condvar.h>
41#include <sys/kernel.h>
42#include <sys/lock.h>

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1073 n->m_len = remain;
1074 m->m_len = len;
1075 n->m_next = m->m_next;
1076 m->m_next = NULL;
1077 return (n);
1078}
1079/*
1080 * Routine to copy from device local memory into mbufs.
1081 */
1082struct mbuf *
1083m_devget(char *buf, int totlen, int off0, struct ifnet *ifp,
1084 void (*copy)(char *from, caddr_t to, u_int len))
1085{
1086 struct mbuf *m;
1087 struct mbuf *top = 0, **mp = &top;
1088 int off = off0, len;
1089 char *cp;
1090 char *epkt;
1091
1092 cp = buf;
1093 epkt = cp + totlen;
1094 if (off) {
1095 cp += off + 2 * sizeof(u_short);
1096 totlen -= 2 * sizeof(u_short);
1097 }
1098 MGETHDR(m, M_DONTWAIT, MT_DATA);
1099 if (m == NULL)
1100 return (NULL);
1101 m->m_pkthdr.rcvif = ifp;
1102 m->m_pkthdr.len = totlen;
1103 m->m_len = MHLEN;
1104
1105 while (totlen > 0) {
1106 if (top) {
1107 MGET(m, M_DONTWAIT, MT_DATA);
1108 if (m == NULL) {
1109 m_freem(top);
1110 return (NULL);
1111 }
1112 m->m_len = MLEN;
1113 }
1114 len = min(totlen, epkt - cp);
1115 if (len >= MINCLSIZE) {
1116 MCLGET(m, M_DONTWAIT);
1117 if (m->m_flags & M_EXT)
1118 m->m_len = len = min(len, MCLBYTES);
1119 else
1120 len = m->m_len;
1121 } else {
1122 /*
1123 * Place initial small packet/header at end of mbuf.
1124 */
1125 if (len < m->m_len) {
1126 if (top == NULL && len +
1127 max_linkhdr <= m->m_len)
1128 m->m_data += max_linkhdr;
1129 m->m_len = len;
1130 } else
1131 len = m->m_len;
1132 }
1133 if (copy)
1134 copy(cp, mtod(m, caddr_t), (unsigned)len);
1135 else
1136 bcopy(cp, mtod(m, caddr_t), (unsigned)len);
1137 cp += len;
1138 *mp = m;
1139 mp = &m->m_next;
1140 totlen -= len;
1141 if (cp == epkt)
1142 cp = buf;
1143 }
1144 return (top);
1145}
1146
1147/*
1148 * Copy data from a buffer back into the indicated mbuf chain,
1149 * starting "off" bytes from the beginning, extending the mbuf
1150 * chain if necessary.

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